Loose-leaf binder.



No. 888,788. M PATBNTED MAY 26, 1903.

d J. G. DAWSON. Loos LEM? BINDER.

APPLIOA'I'ON FILED MAR. 29, 1907.

` UNITED 'STATES PATENTl OFFICE.-

JAnESo. DAWSON, .or ST. LOUIS, MISSoUnI, ASSIGNoR To SIEBERa TRUsSELL .MNFa co.,

A CORPORATION OF MISSOURI..

LOOSE-LEAF BINDER.

Massages.

To all whom it may concern: Y Be it known that I, JAMESC. DAWSON, a citizen' of the United States, and resident of vSt.,iL'ouis, 'Missourl, have invented certain new and useful Improvements 1n L ooseLeaf of'v that tlype. comprising sheet-holding mech cured 'Within a pair of book covers.

"More particularly, the invention relates to loose .leaf bindersof this type in which each` of the'ling rings is composed of a pair of pivotally mounted mating sheet receivin prongs which are' swungon their pivots to open or close the filing rings by a cam slide which is conveniently accessible from the end k of the book.

a. lan 'view showing'the covers and Sheetholding mechanism being o en;-Fig. 2 is a The objectv of the invention is to simplify -andI-improve the construction' and operation of devices of this kind; and the invention-- contemv lates sheet-holding mechanism forv v a loose rea-i binder which is of compact form 'and which may be sucgessfully employedin connection With book "covers vof moderate Size. In the accompanying drawingsFigure 1 is ho ding mechanism of a loose leaf book embodying the invention, the parts of the sheetsectional view taken on the `ne 2 2 of Fig. 1, and shows the parts oi the sheet-holding mechanism in closedfposition; Fig. 3 is similar to Fig. 2 but shows the parts in open position; and Fig 4-jis a sectional view taken von the line llcf4 of Fig. 1, showing the parts of the sheet-holding mechanism in closed po sition.

The book covers or side members of thel binder are shown'at- 10 andll, and each oi"l these cover members has a flexible connec-v tion with a back section 12. Preferablythe back section 12 is composed of two-ply'material, and embedded between its inner and outer layers 13, 14, 1s a=sheet metalpla'te 15 which is curved to give to the back of the `book the customary rounded form.

At each end of the plate 15 there iS provided alu as 16, 17, which projects through the innerayer ,14 of 'the back section of the covers andserves for the attachment of the .i specixcationlof Letters Patent. Application led March 29, 1907. Serial No. 365,215.

. bears downwardly o n the Patented may 26, i908;

'sheet-.holding mechanism. As shownthis mechanism comprises a base-plate 18 hav-4 ing upturned marginal edges 1 9, 20, each of these edges being formed with a marginal bead 21 which providesa longitudinal ilange at each side of the base-platelS and a channel Within Athe lllange. A plurality of openable' iiling rings are provided-for receiving the sheets Vto-'be bound, and each of these rings com rises a pairof curvedprongs 22, 23, each o which is provided, with apivot 24 which extends transverse to the plane of curvature of the prong. In assembling the parts the ivots 24 of. the prongs 22, 23, are seated' Wit in channels' provided by the marginal beads 21 of the v.

ase plate, the inner'ends ofthe prongs extending over the base plate, as indicated at 25,26, and theonter ends of the rongs .-being` movable toward and away om each other to closezor openthe iiling rings. The prongs 22 23, are secure vin place by a cover member 27, which is' preferablyv longitudinally slidable on lthe base plate 18 and 1s provided with cams forfswinging the rongs.. AS shown the cover member 27 as overturned longitudinal edges 28 and 29 which Slidingly engage the marginal iiangesof the base plate provided by the .beads 21, its overturned edges being recessed, as indicated at 30 and 31, to receive the1 prongs 22,

23, the ends of these recessesl engaging the prongs to limit the longitudinal Vmovement of the cover member. .coverfmember'27 is upturned to provide a One end 32 of theu thumb-piece for actuating the cover, andA cams 33, 34, are provided for engaging the inner ends 25, 26,01: the prongs 22, 23, byj

depressing portions of the cover memberl alongits median line. These cams 33, 34, leach have an inclined forward face which rongs 22, 23, between their pivots when t e cover member 27 is moved to the position shown in Fig. 2 to close the iiling rmgs.

To open-theiiling rings when thecams 33, 34, are Withdrawn by the movementof the cover member to the position shown in Fig. 3, ysprings 35 react upwardly on the inner ends of the prongs 22, 23. As shown each of these springs is Securedgtothe base plate 18 by having its inner "'e'nd 36 oli'Set and passed throughan opening 37 in the floor of the base plate. They cannot, therefore, be removed Without first Vlaing turned to a.

v substantially ifertical position, 'and this is' prevented when the' 'parts are assembled by theengagement of the outer ends of the .springs with `the prongs 22, 23 of the ling rings.

The sheet-holding mechanism of the binder is permanently secured to its covers by clenching over the lugs 16, 17, rovidedjl in the back section of the covers, into the ends .of the base-plate 18. The prongs 22, 23, 'of

the filing rings are rigidly held b the cams and ada te i a coverfor edges of the slidebeing overturned to engage 33, 34, to prevent the remova of sheets' romthe binder when the parts are in the closed position, and they are quickly and easilymoved to a Wide open position by pulling outwardly on the thumb-piece 32. sheet metal parts of the binder may all be formed With a tools required those necessary for clenchingover the lugs 16, 17, and the overturned marginal edges 28, 29, of the cover member 27 to prevent its removal. l claim as my invention 1. ln a loose leafl'in'der, in combination, a

wir'.

base plate, an op(enable ilingring comprising a pair of curved prongs each pivotally mounted on the base plate. adjacent one edge thereof to swing in the plane of its curvature and.- eacho'r' theprongs extending inwardly beyond its4 pivot over the (plate, a slide carried by| the base late anV the filing rin an a cam carried by the slide to` bear downwardly pn both prongs o the ring between the pivots'.

2. In a loose leaf binder, in combination, a baseeplate of sheet metal having upturned longitudinal marginal edges, each of such edges of the plate being provided with a bead forming a marginal flange Jfor the base plate and a longitudinal channel Within the flange, a ivot located within the channel at each si e of the base plate, mating slieet'receiving prongs carried by the pivots, a slide formin the base plate, the longitudina The unch and die, and the only t or 4assembling the parts are' passing through,

assise l With the flangesgof the, base plate and being Arecessed tofreceive tbe ,`prongs,\ and prongactuating cams carried by the slide.

3. `In Aa loose l ai binder, in combination," a

`base plate of sheetv metal L'shaped, in transverse section, the upturned edges of the plate being each provided with a bead forming a marginal flange for the base plate and a'lonf gitudinal ychannel Withinthe flange, 4a pivot located Within the channel atfeach side of the base late, mating sheet-receiving prongs carried by the pivots,v each ofthe prongs being extended inwardlybeyond its pivot over the plate, a'slide' forming a cover for the base late, the longitudinal edges of the slide Being engaged with the il'anges of the base plate and being recessed 4 to receive the prongs, a cam carried bythe slide and adaptedto bear downwardly on the prongsA tween the'pivots, and 4a spring reacting upthe prongs,` between the pivots from the floor of the base plate. l j l.

4. In a" loose leaf binder, in combination, a

`base-)plata an opena-ble filing ring comprisA ing a prong pivotally mounted on,tl1e baselate and extended beyond its pivot from the body of theprong over the plate, a slidable plate covering the pivot, the base-plate and slidable plate having intercalating'longitudinal mar inal edges, 'and a cam carried by the slidab e plate for engaging the extended inner end of thep'rong. y

' 5. l'na loose leaf binder, in combination, a

base-plate, an o enable filing ring comprislng a prong pivotal y mounted on the baselate and extended. beyond its pivot from the ody of the prong over the plate, a slidable plate covering the pivot, the baseplate and slidable plate marginal edges,.a cam carried bythe slidable plate for engaging the extended inner end of the prong, and a spring opposing thelcam.

l, JAMES C. 'DAV'V SOl\T.v Witnesses: Q

(Inneres B. Grinsen,- E. M. KLATCHER.

having intercalating longitudinal 

